Theoretical View on the Possibilities of Multi-frequency Remote Sensing of the Water Surface

The research is aimed at the development of original methods of obtaining new information for the study of surface waves in marine conditions. The paper discusses a method for measuring the short-wave part of the wave spectrum (wavelengths in the range from about 50 cm to 2 cm in 6 intervals) in marine conditions. The information obtained will make it possible to study the interaction of wind with the short-wave component of the wave spectrum and will be in demand by scientists engaged in numerical modeling of the global wave climate and interested in refining the model of the interaction of the surface wind with waves. In addition, this will improve the accuracy of retrieving the surface wind speed from remote sensing data. In this paper, a theoretical study of the algorithm for retrieving the slope variance from the shape of the reflected pulse is carried out. The multifrequency underwater acoustic wave gauge will measure the slope variance at the selected surface wave frequency intervals, which will allow us to consider their correlation with the wind speed. A new approach to retrieving the height spectrum of the short-wave part has been developed, using measurements in several frequency intervals.